Craig Mayer, Nick WIlliams, Vojtech Huser
Lister Hill National Center for Biomedical Communications, National Library of Medicine, NIH, Bethesda, MD

See the full regCTG repository at https://github.com/lhncbc/CRI/tree/master/regCTG

To return to the list of conditions and view other reports go to https://lhncbc.github.io/CRI/regCTG/regCTG-condition_report_links.html


Study Counts

Type Study_count
Total_Studies 1662
interventional 1461
Observational 173
Registry 28

Studies over Time

```

Interventional Trials

Intervention Type

intervention_type Study_Count
Drug 597
Drug|Other 111
Drug|Radiation 67
Biological|Drug 64
Procedure 51
Biological 48
Drug|Procedure 47
Biological|Drug|Other 40
Device 39
Drug|placebo 39
Radiation 38
Drug|Other|Radiation 31
Other 27
Drug|Procedure|Radiation 20
Drug|Other|Procedure 18
Biological|Other 15
Device|Drug 13
Drug|Other|placebo 11
Biological|Drug|Procedure 10
Biological|Drug|Radiation 10
Other|Radiation 10
Diagnostic Test 9
Drug|Other|Procedure|Radiation 9
Other|Procedure 8
Biological|Drug|Other|placebo 7
Other|Procedure|Radiation 7
Biological|Drug|placebo 6
Biological|Drug|Procedure|Radiation 6
Biological|Drug|Other|Procedure|Radiation 5
Behavioral 4
Biological|Drug|Other|Procedure 4
Biological|Other|Radiation 4
Combination Product 4
Dietary Supplement 4
Behavioral|Other 3
Biological|Other|Procedure 3
Biological|Procedure 3
Device|Procedure 3
Dietary Supplement|Drug 3
Drug|Genetic 3
Drug|Genetic|Other 3
Drug|Other|placebo|Procedure 3
Drug|placebo|Radiation 3
Genetic 3
Procedure|Radiation 3
Behavioral|Dietary Supplement|Other 2
Behavioral|Radiation 2
Biological|Drug|Other|Radiation 2
Biological|Other|placebo 2
Combination Product|Drug 2
Device|Drug|Other 2
Device|Drug|Procedure 2
Diagnostic Test|Drug 2
Dietary Supplement|Drug|Other 2
Drug|Genetic|Other|Procedure 2
Behavioral|Device|Other|Procedure|Radiation 1
Behavioral|Other|Procedure 1
Behavioral|Procedure 1
Biological|Combination Product 1
Biological|Device|Drug|Other 1
Biological|Drug|Genetic|Other 1
Biological|Drug|placebo|Radiation 1
Biological|Other|Procedure|Radiation 1
Biological|placebo 1
Biological|Radiation 1
Combination Product|Other 1
Combination Product|Other|Procedure 1
Device|Diagnostic Test 1
Device|Drug|Radiation 1
Device|Other 1
Device|Other|Procedure|Radiation 1
Device|Procedure|Radiation 1
Dietary Supplement|Drug|Other|placebo|Procedure 1
Dietary Supplement|Drug|Other|placebo|Radiation 1
Dietary Supplement|Other|placebo 1
Dietary Supplement|Other|placebo|Procedure 1
Dietary Supplement|placebo 1
Drug|Genetic|Other|Procedure|Radiation 1
Drug|Other|placebo|Radiation 1
Genetic|placebo 1

Count of Studies by Intervention (normalized and mapped)

Interventions over Time

Weekly studies for each intervention

Studies by Country

Country Study_Count
United States 837
China 86
France 54
Korea, Republic of 40
Germany 38
Canada 32
United Kingdom 25
United States|Canada 25
NA 22
Italy 16
Spain 15
United States|Puerto Rico 8
Japan 7
Denmark 6
Belgium 5
Brazil 5
Netherlands 5
Russian Federation 5
Switzerland 5
Taiwan 5
Turkey 4
United States|Canada|Korea, Republic of 4
United States|Japan 4
United States|Spain 4
United States|United Kingdom 4
Australia 3
Cuba 3
Egypt 3
India 3
Israel 3
Singapore 3
Sweden 3
United States|Germany 3
United States|Korea, Republic of 3
Australia|New Zealand 2
Belgium|Netherlands 2
Hong Kong 2
Iran, Islamic Republic of 2
Japan|Korea, Republic of|Taiwan 2
Norway 2
Poland 2
Portugal 2
United States|Canada|Israel 2
United States|Canada|Japan|Korea, Republic of 2
United States|Canada|Puerto Rico 2
United States|Canada|Switzerland 2
United States|France 2
United States|France|Germany 2
United States|Israel 2
United States|Japan|Korea, Republic of 2
United States|Mexico 2
United States|Netherlands 2
Argentina 1
Australia|Belgium|Germany|Netherlands|Switzerland|United Kingdom 1
Austria|Belgium|Denmark|Germany|Lithuania|Netherlands|Norway|Spain|Sweden 1
Austria|Belgium|Netherlands 1
Austria|France|Germany|Hungary|Switzerland 1
Austria|Germany|Spain|United Kingdom 1
Belarus|Hungary|Poland|Russian Federation|Ukraine 1
Belgium|Canada|France 1
Belgium|France|Germany|Hungary|Netherlands|Poland|United Kingdom 1
Belgium|France|Germany|Italy|Poland|Spain 1
Belgium|France|Netherlands|Switzerland 1
Belgium|Norway 1
Belgium|United Kingdom 1
Bosnia and Herzegovina|Croatia|Korea, Republic of|Spain|Taiwan|United Kingdom 1
Brazil|Canada|Cyprus|United Kingdom 1
Canada|France 1
China|Korea, Republic of|Malaysia|Taiwan 1
China|Korea, Republic of|Thailand 1
China|Malaysia|Philippines|Thailand 1
Czech Republic|Hungary|Ukraine 1
Czechia 1
Czechia|France|Germany|Israel|Italy|Norway|Poland|Portugal|Spain|United Kingdom 1
Denmark|France|Ireland|United Kingdom 1
Denmark|France|Sweden|United Kingdom 1
Denmark|Netherlands|United Kingdom 1
Finland|Sweden 1
France|Germany 1
France|Martinique 1
France|Spain 1
France|United States|Belgium|China|Germany|Hong Kong|Italy|Korea, Republic of|Netherlands|Singapore|Spain|Taiwan|United Kingdom 1
Georgia|Hong Kong|India|Moldova, Republic of|Serbia|Taiwan|Thailand|Ukraine 1
Germany|Latvia 1
Germany|Netherlands 1
Germany|Spain|Switzerland 1
Germany|Switzerland 1
Germany|United States|Australia|Belgium|Canada|France|Israel|Italy|Korea, Republic of|Netherlands|Spain|United Kingdom 1
Greece 1
Hong Kong|United States|Belgium|Brazil|Czech Republic|Egypt|France|Germany|Hungary|Italy|Korea, Republic of|Netherlands|Russian Federation|Singapore|South Africa|Spain|Switzerland|Taiwan|Thailand|Turkey|United Kingdom 1
Japan|Korea, Republic of 1
Jordan|Lebanon 1
Latvia|Turkey|Hungary 1
Lithuania 1
Norway|Sweden 1
Poland|Ukraine 1
Russian Federation|Bulgaria|Czechia|Germany|Latvia|Ukraine 1
Saudi Arabia 1
Spain|Australia|Canada|China|France|Germany|Hong Kong|Ireland|Korea, Republic of|Norway|Singapore|Sweden|Taiwan|United Kingdom 1
Spain|United Kingdom 1
United States|Argentina|Australia|Austria|Belgium|Brazil|Canada|Chile|France|Germany|Hong Kong|Hungary|Ireland|Italy|Japan|Korea, Republic of|Malaysia|Peru|Philippines|Romania|Russian Federation|Taiwan|Thailand|Ukraine|United Kingdom 1
United States|Argentina|Australia|Belgium|Brazil|Canada|France|Germany|Italy|Netherlands|Norway|Russian Federation|Sweden|Ukraine|United Kingdom 1
United States|Argentina|Australia|Bosnia and Herzegovina|Brazil|Canada|Chile|Colombia|Croatia|Czechia|Egypt|Guatemala|India|Indonesia|Italy|Korea, Republic of|Lebanon|Malta|Mexico|New Zealand|Philippines|Poland|Romania|Russian Federation|South Africa|Spain|Taiwan|Thailand|Turkey|United Kingdom 1
United States|Argentina|Australia|France|Hungary|New Zealand|Poland|Romania|Russian Federation|Slovakia|Turkey|United Kingdom 1
United States|Argentina|Austria|Canada|China|Croatia|Greece|Ireland|Japan|Korea, Republic of|Malaysia|Netherlands|Portugal|Romania|Spain|Taiwan|Thailand|Turkey|United Kingdom 1
United States|Argentina|Belgium|Canada|Czechia|Denmark|Finland|France|Germany|Hungary|Israel|Italy|Japan|Mexico|Netherlands|Poland|Puerto Rico|Russian Federation|Spain|United Kingdom 1
United States|Argentina|Belgium|Canada|France|Germany|Netherlands|Poland|United Kingdom 1
United States|Australia 1
United States|Australia|Austria|Belgium|Canada|China|Czechia|France|Germany|Italy|Japan|Korea, Republic of|Netherlands|Poland|Portugal|Russian Federation|Singapore|Spain|Taiwan|Ukraine 1
United States|Australia|Austria|Belgium|Canada|France|Germany|Italy|Russian Federation|Spain|Ukraine 1
United States|Australia|Belgium|Brazil|Canada|Chile|China|Colombia|France|Germany|Israel|Italy|Japan|Korea, Republic of|Mexico|Peru|Poland|Spain|Taiwan|United Kingdom 1
United States|Australia|Belgium|Brazil|Canada|Czech Republic|Greece|Korea, Republic of|New Zealand|Poland|Portugal|Romania|Russian Federation|Spain 1
United States|Australia|Belgium|Brazil|Czechia|France|Germany|Hungary|Italy|Spain 1
United States|Australia|Belgium|Canada|Germany|Italy|Spain|United Kingdom 1
United States|Australia|Belgium|Canada|Hong Kong|Italy|Korea, Republic of|Poland|Russian Federation|Spain|United Kingdom 1
United States|Australia|Belgium|Canada|Spain|United Kingdom 1
United States|Australia|Belgium|Chile|Colombia|Czechia|France|Germany|Hungary|Italy|Peru|Poland|Romania|Spain|Turkey|United Kingdom 1
United States|Australia|Belgium|Czechia|France|Germany|Italy|Korea, Republic of|Poland|Spain 1
United States|Australia|Belgium|France|Hungary|Italy|Poland|Spain|United Kingdom 1
United States|Australia|Belgium|France|Israel|Spain|Taiwan|United Kingdom 1
United States|Australia|Brazil|Canada|Chile|China|Colombia|France|Guatemala|Hong Kong|Ireland|Israel|Japan|Korea, Republic of|Mexico|New Zealand|Peru|Poland|Russian Federation|South Africa|Spain|Switzerland|Taiwan|Turkey|Ukraine|United Kingdom 1
United States|Australia|Brazil|Canada|France|Germany|Hungary|Italy|Japan|Korea, Republic of|Romania|Russian Federation|Spain|Taiwan|Thailand|Turkey|United Kingdom 1
United States|Australia|Brazil|Chile|China|France|Germany|Guatemala|Ireland|Israel|Italy|Japan|Korea, Republic of|New Zealand|Poland|Russian Federation|Spain|Turkey|Ukraine|United Kingdom 1
United States|Australia|Canada|Germany|Italy|Poland|Russian Federation|Spain 1
United States|Australia|Canada|Ireland|New Zealand|Peru|Puerto Rico|United Kingdom 1
United States|Australia|Canada|Japan|Singapore|Spain|United Kingdom 1
United States|Australia|China|Japan 1
United States|Australia|France|Ireland|Italy|Japan|Korea, Republic of|Spain|Taiwan 1
United States|Australia|France|Japan 1
United States|Australia|Korea, Republic of|Taiwan 1
United States|Australia|New Zealand|Poland|Thailand 1
United States|Australia|Norway|Spain 1
United States|Australia|Singapore 1
United States|Australia|Spain 1
United States|Austria|Canada|Czechia|France|Hungary|Israel|Italy|Poland|Spain|Switzerland 1
United States|Belgium 1
United States|Belgium|Brazil|Canada|Chile|France|Germany|Israel|Italy|Japan|Korea, Republic of|Malaysia|Poland|Russian Federation|Singapore|Taiwan|Ukraine|United Kingdom 1
United States|Belgium|Canada|Czechia|Germany|Greece|Italy|Spain|Sweden|Turkey|Ukraine 1
United States|Belgium|Canada|France|Israel|Italy|Singapore|Spain|Taiwan 1
United States|Belgium|Canada|Israel 1
United States|Belgium|Canada|Spain 1
United States|Belgium|France|Germany|Italy|Korea, Republic of|Spain|United Kingdom 1
United States|Belgium|Italy 1
United States|Belgium|Italy|Spain|United Kingdom 1
United States|Belgium|Korea, Republic of|Netherlands|Poland 1
United States|Belgium|United Kingdom 1
United States|Bulgaria|Poland|Romania|Russian Federation|Ukraine 1
United States|Canada|France 1
United States|Canada|France|Germany|Hungary|Spain 1
United States|Canada|France|Germany|Mexico|Poland|Russian Federation 1
United States|Canada|France|Netherlands 1
United States|Canada|France|Netherlands|United Kingdom 1
United States|Canada|Germany|Korea, Republic of|Netherlands|Spain 1
United States|Canada|Hong Kong 1
United States|Canada|Ireland|Switzerland 1
United States|Canada|Japan|Korea, Republic of|Puerto Rico 1
United States|Canada|Japan|Korea, Republic of|Singapore|Taiwan 1
United States|Canada|Peru|Puerto Rico|South Africa 1
United States|Canada|Peru|South Africa 1
United States|Canada|Singapore 1
United States|Chile|Denmark|Estonia|France|Hungary|Italy|Korea, Republic of|Russian Federation|Taiwan|Turkey 1
United States|China|France|Italy|Japan|Korea, Republic of|Poland|Puerto Rico|Romania|Russian Federation|Spain|Taiwan|Turkey|United Kingdom 1
United States|Czech Republic|France|Poland|Spain|United Kingdom 1
United States|Denmark|France|Spain 1
United States|Finland|Netherlands|Sweden|United Kingdom 1
United States|France|Germany|Hong Kong|Italy|Japan|Korea, Republic of|Poland|Russian Federation|Singapore|Spain|Taiwan 1
United States|France|Germany|Israel|Italy|Korea, Republic of|Spain|Taiwan 1
United States|France|Germany|Italy|Japan|Korea, Republic of|Poland|Romania|Russian Federation|Taiwan|Ukraine|United Kingdom 1
United States|France|Germany|Japan|Spain|United Kingdom 1
United States|France|Germany|Korea, Republic of|Netherlands|Spain|Taiwan|United Kingdom 1
United States|France|Hungary|Israel|Korea, Republic of|Romania|Russian Federation|Taiwan 1
United States|France|Israel|Korea, Republic of 1
United States|France|Italy|Korea, Republic of|Taiwan 1
United States|France|United Kingdom 1
United States|Germany|Korea, Republic of|Netherlands|Spain|Taiwan|United Kingdom 1
United States|Germany|Korea, Republic of|Spain 1
United States|Hong Kong|Japan|Korea, Republic of|Taiwan 1
United States|Hong Kong|Japan|Singapore|Taiwan 1
United States|Hungary|India|Russian Federation|Ukraine 1
United States|Israel|Argentina|Australia|Austria|Belgium|Brazil|Bulgaria|Chile|Estonia|France|Germany|Hungary|Italy|Japan|Korea, Republic of|Lithuania|Mexico|Poland|Portugal|Romania|Russian Federation|Singapore|Spain|Taiwan|United Kingdom 1
United States|Israel|Korea, Republic of|Spain 1
United States|Italy 1
United States|Korea, Republic of|Spain|United Kingdom 1
United States|Netherlands|Peru 1
United States|Norway|Spain|United Kingdom 1
United States|Peru|South Africa 1
United States|Russian Federation 1
United States|South Africa 1
Vietnam 1

Sites per Study

Site_count Study_Count
1 769
2 130
3 75
4 42
5 36
6 29
7 31
8 17
9 19
10 12
11 10
12 7
13 9
14 14
15 8
16 11
17 5
18 7
19 4
20 9
21 5
22 7
23 9
24 5
25 6
26 5
27 2
28 5
29 3
30 5
31 3
32 3
33 2
34 3
35 4
36 4
37 1
39 3
41 2
42 1
43 4
44 2
45 1
46 3
47 1
48 1
49 1
50 1
51 1
52 2
54 1
55 2
56 1
57 2
59 3
61 1
62 3
63 1
66 1
68 1
72 1
73 2
75 1
78 2
79 1
81 1
86 2
87 2
93 1
95 2
96 1
97 1
101 1
103 1
106 1
107 1
108 1
113 1
115 1
116 1
133 1
134 1
135 1
140 2
141 1
145 1
147 1
154 1
155 1
157 2
161 1
162 1
163 1
167 3
170 1
180 1
182 1
186 1
187 2
193 1
196 1
200 1
221 1
224 1
227 1
233 2
234 1
235 1
241 1
255 1
267 1
280 1
283 1
315 1
337 1
358 1
364 1
366 1
393 1
410 1
433 1
439 1
476 1
504 1
508 3
534 1
539 1
540 1
549 1
573 1
632 1
634 1
640 1
663 1
670 1
672 1
687 1
699 1
709 1
718 1
756 1
789 1
798 1
807 1
849 1
894 1
895 1
931 1
936 1
937 1
1230 1
1296 1
1498 1

Phase

Phase Study_Count
Phase 2 658
Phase 1 265
N/A 176
Phase 3 153
Phase 1/Phase 2 148
Phase 2/Phase 3 25
Early Phase 1 23
Phase 4 13

Number of Arms

Number_of_Arms Count_of_Studies
1 762
2 460
3 88
4 50
5 8
6 13
7 7
9 4
10 2
11 2
13 1
14 1
15 1
NA 62

Number of Updates

Count of Versions Count of Studies
1 53
2 115
3 121
4 90
5 86
6 92
7 60
8 64
9 46
10 59
11 45
12 43
13 41
14 37
15 38
16 26
17 29
18 30
19 23
20 20
21 16
22 20
23 13
24 14
25 8
26 8
27 12
28 10
29 6
30 9
31 4
32 7
33 5
34 8
35 7
36 7
37 5
38 2
39 7
40 4
41 5
42 3
43 2
44 3
45 1
46 2
47 1
48 2
50 9
51 2
52 5
53 1
54 1
55 1
56 3
57 4
58 3
59 4
60 1
61 1
62 1
63 1
64 5
66 2
67 2
68 4
69 1
71 3
72 3
73 1
74 3
75 2
77 1
78 1
80 3
81 3
82 2
85 3
86 2
88 1
89 1
90 1
91 1
93 1
94 1
95 3
97 2
100 1
101 1
102 1
105 2
106 1
107 1
112 2
116 1
123 2
124 2
127 1
131 1
136 1
138 1
142 1
146 1
156 1
157 1
192 1
195 1
197 1
205 2
212 1
218 1
221 1
222 1
238 1
241 1
268 1
287 1
297 1
307 1
324 1
342 1
346 1
364 1
383 1
399 1
403 1
415 1
430 2
453 1
463 1
489 1
501 1
508 1
518 1
533 1
569 1
664 1
704 1
935 1
1073 1
1145 1
1228 1
1366 1
1521 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 41743 1408 29.647017
Contacts/Locations 23903 1314 18.191020
Recruitment Status 2762 1268 2.178233
Arms 2534 820 3.090244
Interventions 2534 820 3.090244
Eligibility 2489 854 2.914520
Study Design 2142 983 2.179044
Study Identification 2115 769 2.750325
Study Description 2051 729 2.813443
Outcome Measures 1857 839 2.213349
None (earliest Version on record) 1461 1461 1.000000
Conditions 1360 558 2.437276
Oversight 1314 754 1.742706
Sponsor/Collaborators 1180 679 1.737850
More Information 631 157 4.019108
References 588 273 2.153846
Results 250 250 1.000000
IPDSharing 188 163 1.153374
Results Submission Events 94 94 1.000000
Documents 88 85 1.035294
Baseline Characteristics 78 57 1.368421
Reported Adverse Events 53 48 1.104167
Participant Flow 45 40 1.125000
2020Recruitment Status 2 2 1.000000
Quality Control Review has not concludedReturned: June 9 1 1 1.000000
Quality Control Review has not concludedReturned: March 20 1 1 1.000000

Enrollment Metrics by Phase

Measure Early.Phase.1 N.A Phase.1 Phase.1.Phase.2 Phase.2 Phase.2.Phase.3 Phase.3 Phase.4
Min. 8.00000 2.0000 1.00000 2.00000 1.00000 42.0000 5.0000 3.0000
1st Qu. 13.50000 25.0000 18.00000 34.75000 30.00000 123.7500 297.7500 40.0000
Median 19.00000 66.5000 28.00000 60.00000 50.00000 258.0000 496.0000 86.0000
Mean 20.95652 236.3068 43.14015 89.52027 82.17152 337.4583 734.0789 232.4615
3rd Qu. 30.00000 150.7500 45.00000 115.00000 90.00000 472.0000 766.5000 143.0000
Max. 37.00000 8300.0000 474.00000 527.00000 1400.00000 1408.0000 10273.0000 1030.0000

Trial Group Type

group_type Group_Count
Experimental 1909
Active Comparator 345
Other 78
NA 62
Placebo Comparator 60
No Intervention 39
Sham Comparator 2

Intervention Model

intervention_model Study_Count
Single Group Assignment 824
Parallel Assignment 547
Sequential Assignment 47
Crossover Assignment 21
NA 17
Factorial Assignment 5

Primary Purpose

primary_purpose Study_Count
Treatment 1301
Diagnostic 80
Prevention 24
Supportive Care 15
Other 14
Health Services Research 10
Screening 7
Basic Science 5
NA 4
Device Feasibility 1

Observational Studies

Studies by Country

Country Study_Count
United States 58
France 17
Italy 11
NA 11
United Kingdom 11
China 9
Canada 6
Belgium 5
Netherlands 4
Ireland 3
Korea, Republic of 3
Taiwan 3
Greece 2
Morocco 2
Spain 2
Algeria|Morocco 1
Belgium|Denmark|France|Germany|Italy|Netherlands|Norway|Romania|Spain|United Kingdom 1
Denmark 1
Denmark|France|Germany|Italy|Norway|Romania|Spain|United Kingdom 1
France|Belgium 1
France|Germany|Italy|Japan|Netherlands|Spain|Sweden|United Kingdom 1
Germany 1
Germany|Serbia|United Kingdom 1
Hungary 1
Kazakhstan 1
Norway 1
Pakistan 1
Russian Federation 1
Serbia 1
Switzerland 1
Thailand 1
Turkey 1
United States|Australia|Canada 1
United States|Canada|Germany 1
United States|Canada|Hong Kong 1
United States|Canada|Spain|Sweden|United Kingdom 1
United States|Israel 1
United States|Netherlands 1
United States|Netherlands|United Kingdom 1
United States|Puerto Rico 1
United States|Switzerland 1

Sites per Study

Site_count Study_Count
1 119
2 9
3 5
4 6
5 3
6 1
7 4
8 2
9 3
10 3
12 2
13 1
14 2
16 3
17 1
18 2
19 1
22 1
36 1
57 1
66 1
101 1
143 1

Number of Updates

Count of Versions Count of Studies
1 38
2 32
3 22
4 14
5 9
6 12
7 4
8 7
9 4
10 2
11 6
12 2
13 1
14 3
16 1
17 2
18 3
20 2
21 1
24 2
51 1
52 1
54 1
66 1
72 1
110 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 1070 135 7.925926
Contacts/Locations 352 103 3.417476
None (earliest Version on record) 173 173 1.000000
Recruitment Status 143 90 1.588889
Study Design 136 81 1.679012
Study Description 131 51 2.568627
Eligibility 91 49 1.857143
Sponsor/Collaborators 70 44 1.590909
Groups 69 43 1.604651
Interventions 69 43 1.604651
Study Identification 69 41 1.682927
Outcome Measures 65 42 1.547619
Conditions 53 27 1.962963
Oversight 45 34 1.323529
IPDSharing 14 12 1.166667
References 11 8 1.375000
More Information 4 1 4.000000
Results 3 3 1.000000
Results Submission Events 1 1 1.000000

Enrollment Metrics

Measure Observational
Min 3.000
1st Qu 58.000
Median 152.000
Mean 5035.756
3rd Qu 500.000
Max 684815.000

Observation Model

observational_model Study_Count
Cohort 117
Case-Only 32
Case-Control 14
Other 4
Case Control 3
NA 2
Ecologic or Community 1

Time Perspective

time_perspective Study_Count
Prospective 120
Retrospective 40
Cross-Sectional 9
Other 2
NA 2

Registries

Studies by Country

Country Study_Count
United States 7
China 3
Germany 3
NA 3
Spain 2
Brazil 1
Canada 1
Denmark 1
France 1
Italy 1
Korea, Republic of 1
Luxembourg 1
Singapore 1
Sweden 1
United States|Israel 1

Sites per Study

Site_count Study_Count
1 22
2 2
4 1
6 1
7 1
17 1

Number of Updates

Count of Versions Count of Studies
1 10
2 8
3 2
4 1
5 3
6 1
7 1
8 1
22 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 66 18 3.666667
Contacts/Locations 28 11 2.545454
None (earliest Version on record) 28 28 1.000000
Recruitment Status 11 10 1.100000
Study Design 11 9 1.222222
Sponsor/Collaborators 8 7 1.142857
Eligibility 3 1 3.000000
Groups 2 2 1.000000
Interventions 2 2 1.000000
IPDSharing 2 2 1.000000
Outcome Measures 2 2 1.000000
Oversight 2 2 1.000000
Study Description 2 2 1.000000
Study Identification 2 2 1.000000
Conditions 1 1 1.000000
References 1 1 1.000000

Enrollment Metrics

Measure Registries
Min 8.000
1st Qu 89.750
Median 200.000
Mean 1865.893
3rd Qu 762.500
Max 31795.000

Registry Model

observational_model Study_Count
Cohort 21
Case-Only 3
Other 2
Case-Control 1
Case Control 1

Time Perspective

time_perspective Study_Count
Prospective 26
Cross-Sectional 1
Other 1

Follow-up

target_duration Study_Count
5 Years 6
10 Years 4
2 Years 4
3 Years 4
1 Year 3
1 Month 2
12 Months 1
30 Days 1
8 Years 1
90 Days 1
99 Years 1